Keep watering till the end, it's the only thing you can do at this point.
Use a loupe, at least 30x magnification.
Peel open a flower, so you can see trichomes which are not directly exposed to light. Count 20 trichomes. One amber in 20 is 5% amber, 2 is 10% and 3 is 15%. I've found above 5% to be the minimum for full effect time.
Less than 5% and the effects only last for 45 minutes to an hour. Yes, it's speedier and more upbeat, but you've lost yield and now have to smoke more often. Not my cup of tea.
Over 15% and most strains have more of a flat, muddled effect and are much too sleepy for me. I love life and am doing my best to stay awake while I enjoy my cannabis.
Many people attribute this narcotic sleepiness to 'potency,' and also seem to like falling asleep. To each their own.